changed?

# File activemodel/lib/active_model/attribute_mutation_tracker.rb, line 46
    def changed?(attr_name, from: OPTION_NOT_GIVEN, to: OPTION_NOT_GIVEN)
      attr_name = attr_name.to_s
      forced_changes.include?(attr_name) ||
        attributes[attr_name].changed? &&
        (OPTION_NOT_GIVEN == from || attributes[attr_name].original_value == from) &&
        (OPTION_NOT_GIVEN == to || attributes[attr_name].value == to)
    end